Is there a reason why the most files in the module are read only for the user?

16 -r--r--r-- 1 xxx xxx 14279 Dec 20  2008 ftp.backend.inc
16 -rw-r--r-- 1 xxx xxx 14940 Apr 23  2006 LICENSE.txt
28 -r--r--r-- 1 xxx xxx 25023 Sep  5  2009 plugin_manager.admin.inc
 4 -rw-r--r-- 1 xxx xxx   406 Sep 10  2009 plugin_manager.info
 8 -r--r--r-- 1 xxx xxx  6035 Dec 15  2008 plugin_manager.install
24 -r--r--r-- 1 xxx xxx 22972 Sep 10  2009 plugin_manager.module
 4 -r--r--r-- 1 xxx xxx   435 Jan 30  2009 plugin_manager_search.css
 8 -r--r--r-- 1 xxx xxx  5370 Dec 26  2008 plugin_manager_search.js
 4 -r--r--r-- 1 xxx xxx  1795 Sep 10  2009 README.txt
 4 -r--r--r-- 1 xxx xxx  3772 Dec 15  2008 ssh.backend.inc
 4 drwxr-xr-x 2 xxx xxx  4096 Sep 10  2009 translations

Was not a problem to install but it could be when updating.